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001-es BibID:	BIBFORM054066
Első szerző:	Barta Zoltán (biológus, zoológus)
Cím:	Social Role Specialization Promotes Cooperation between Parents / Zoltán Barta, Tamás Székely, András Liker, Freya Harrison
Dátum:	2014
Megjegyzések:	Biparental care of offspring is a widespread social behavior, and various ecological, life-history, and demographic factors have been proposed to explain its evolution and maintenance. Raising offspring generally requires several types of care (e.g., feeding, brooding, and defense), and males and females often specialize in providing diffferent types of care. However, theoretical models of care often assume that care is a single variable and hence that a unit of care by the mother is interchangable with a unit of care by the father. We hypothesize that the ability of one parent to provide all types of care may be limited by nonadditive costs or by sex-based asymmetries in the costs of particular care types. Using an individual-based simulation, we show that synergistic costs of investing in two tasks or negligible sex-based cost asymmetries select for task specialization and biparental care. Biparental care persists despite intense sexual selection and sex-based mortality, suggesting that previous models make overly restrictive predictions of the conditions under which cooperation can be maintained. Our model provides a mechanistic underpinning for published models that show that the synergistic benefits of individuals cooperating can stabilize cooperation, both in the context of parental care and in other social scenarios.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban evolutionary simulation mortality parental care sexual selection social evolution Élettudományok - Biológiai tudományok
Megjelenés:	The american naturalist. - 183 : 6 (2014), p. 747-761. -
További szerzők:	Székely Tamás (1959-) (biológus) Liker András Harrison, Freya
Pályázati támogatás:	MTA-DE Lendület MTA Viselkedésökológiai Kutatócsoport
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM022957
Első szerző:	Barta Zoltán (biológus, zoológus)
Cím:	Sexual Conflict about Parental Care : the Role of Reserves / Zoltán Barta, Alasdair I. Houston, John M. McNamara, Tamás Székely
Dátum:	2002
Megjegyzések:	Parental care often increases the survival of offspring, but it is costly to parents. Because of this trade-off, a sexual conflict over care arises. The solution to this conflict depends on the interactions between the male and female parents, the behavior of other animals in the population, and the individual differences within a sex. We take an integrated approach and develop a state-dependent dynamic game model of parental care. The model investigates a single breeding season in which the animals can breed several times. Each parent's decision about whether to care for the brood or desert depends on its own energy reserves, its mate's reserves, and the time in the season. We develop a fully consistent solution in which the behavior of an animal is the best given the behavior of its mate and of all other animals in the population. The model predicts that females may strategically reduce their own reserves so as to "force" their mate to provide care. We investigate how the energy costs of caring and searching for a mate, values of care (how the probability of offspring survival depends on the pattern of care), and population sex ratio influence the pattern of care over the breeding season.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban sexual conflict parental care offspring desertion dynamic game reserves body mass regulation
Megjelenés:	American Naturalist. - 159 : 6 (2002), p. 687-705. -
További szerzők:	Houston, Alasdair I. McNamara, John M. Székely Tamás (1959-) (biológus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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001-es BibID:	BIBFORM018790
Első szerző:	McNamara, John M.
Cím:	A Theoretical Investigation of the Effect of Latitude on Avian Life Histories / John M. McNamara, Zoltán Barta, Martin Wikelski, Alasdair I. Houston
Dátum:	2008
Megjegyzések:	Tropical birds lay smaller clutches than birds breeding in temperate regions and care for their young for longer. We develop a model in which birds choose when and how often to breed and their clutch size, depending on their foraging ability and the food availability. The food supply is density dependent. Seasonal environments necessarily have a high food peak in summer; in winter, food levels drop below those characteristic of constant environments. A bird that cannot balance its energy needs during a week dies of starvation. If adult predation is negligible, birds in low seasonal environments are constrained by low food during breeding seasons, whereas birds in high seasonal environments die during the winter. Low food seasonality selects for small clutch sizes, long parental care times, greater age at first breeding, and high juvenile survival. The inclusion of adult predation has no major effect on any life-history variables. However, increased nest predation reduces clutch size. The same trends with seasonality are also found in a version of the model that includes a condition variable. Our results show that seasonal changes in food supply are sufficient to explain the observed trends in clutch size, care times, and age at first breeding.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban annual routine, clutch size, energy balance, parental care.
Megjelenés:	The American Naturalist. - 172 : 3 (2008), p. 331-345. -
További szerzők:	Barta Zoltán (1967-) (biológus, zoológus) Wikelski, Martin Houston, Alasdair I.
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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